Stick mixer



FIG. 1 is a perspective view of a stick mixer showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a top plan view thereof.

The broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an stick mixer, as shown and described. 